package com.thc.utils;

import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

public class SetCharacterEncodingFilter implements Filter {

	protected String encoding = null;

	protected FilterConfig filterConfig = null;

	public void destroy() {

		this.encoding = null;
		this.filterConfig = null;

	}

	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
			throws IOException, ServletException {

		if (request.getCharacterEncoding() == null) {
			String encoding = selectEncoding(request);
			if (encoding != null) {
				request.setCharacterEncoding(encoding);
			}
		}

		chain.doFilter(request, response);

	}

	public void init(FilterConfig filterConfig) throws ServletException {

		this.filterConfig = filterConfig;
		this.encoding = filterConfig.getInitParameter("encoding");

	}

	protected String selectEncoding(ServletRequest request) {

		return (this.encoding);

	}

}
